Where does everybody find this stuff? So far I've tried Walmart (where I buy most my vitamins/minerals) and GNC and both only have magnesium oxide. I guess I could buy online, but I'd hate to pay shipping for something I figured would be cheap anyway.

I'm surprised GNC doesn't have it, I've always gotten the NOW brand online. YOu might check a more general health food type store that sells supplements. I imagine by the time you pay full retail, ordering it online + shipping would be about the same price.

Thanks for the suggestions. I ended up just buying it from 1fast400 for $15 with shipping for 250 tabs. Looks like it still is cheaper than what The Vitamin Shoppe offers and the closest one is like an hour away anyway.